[原文]isakmpd in OpenBSD 3.4 and earlier allows remote attackers to cause a denial of service (infinite loop) via an ISAKMP packet with a zero-length payload, as demonstrated by the Striker ISAKMP Protocol Test Suite.

Rapid7 Security Advisory - OpenBSD isakmpd payload handling is subject to multiple denial of service vulnerabilities. Known vulnerable: OpenBSD 3.4 and earlier, OpenBSD-current as of March 17, 2004.

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Rapid7 Advisory R7-0018
OpenBSD isakmpd payload handling denial-of-service vulnerabilities
Published: March 23, 2004
Revision: 1.0
http://www.rapid7.com/advisories/R7-0018.html
CVE: CAN-2004-0218, CAN-2004-0219, CAN-2004-0220, CAN-2004-0221,
CAN-2004-0222
1. Affected system(s):
KNOWN VULNERABLE:
o OpenBSD 3.4 and earlier
o OpenBSD-current as of March 17, 2004
2. Summary
The ISAKMP packet processing functions in OpenBSD's isakmpd
daemon contain multiple payload handling flaws that allow
a remote attacker to launch a denial of service attack
against the daemon.
Carefully crafted ISAKMP packets will cause the isakmpd daemon
to attempt out-of-bounds reads, exhaust available memory, or
loop endlessly (consuming 100% of the CPU).
3. Vendor status and information
OpenBSD
http://www.openbsd.org
OpenBSD has been notified of the issues and they have provided
source code patches to fix the problems for -current, 3.4-stable,
and 3.3-stable. See http://www.openbsd.org/errata.html for
more information.
The isakmpd daemon in the upcoming OpenBSD 3.5 release will be
privilege-separated, which greatly lessens the risk of any
future vulnerabilities that may be found.
4. Solution
Update and rebuild the isakmpd daemon:
cd /usr/src/sbin/isakmpd
cvs update -dP
make clean && make obj && make && sudo make install
You can also apply the appropriate patches from
http://www.openbsd.org/errata.html instead of using CVS.
5. Detailed analysis
To test the security and robustness of IPSEC implementations
from multiple vendors, the security research team at Rapid7
has designed the Striker ISAKMP Protocol Test Suite. Striker
is an ISAKMP packet generation tool that automatically produces
and sends invalid and/or atypical ISAKMP packets.
This advisory is the first in a series of vulnerability
disclosures discovered with the Striker test suite. Striker
will be made available to qualified IPSEC vendors. Please
email advisory@rapid7.com for more information on obtaining
Striker.
OpenBSD's isakmpd daemon performs insufficient validation on
payload lengths and payload field lengths before attempting to
read the fields. This results in out-of-bounds reads in several
cases.
Denial of service by 0-length ISAKMP payload
CVE ID: CAN-2004-0218
An ISAKMP packet with a malformed payload having a self-reported
payload length of zero will cause isakmpd to enter an infinite
loop, parsing the same payload over and over again.
This issue is similar to CAN-2003-0989, which affected TCPDUMP.
Denial of service by various malformed ISAKMP IPSEC SA payload
CVE ID: CAN-2004-0219
An ISAKMP packet with a malformed IPSEC SA payload will
cause isakmpd to read out of bounds and crash.
Denial of service by malformed ISAKMP Cert Request payload
CVE ID: CAN-2004-0220
An ISAKMP packet with a malformed Cert Request payload
will cause an integer underflow, resulting in a failed
malloc of a huge amount of memory.
Denial of service by malformed ISAKMP Delete payload
CVE ID: CAN-2004-0221
An ISAKMP packet with a malformed delete payload having
a large number of SPIs will cause isakmpd to read out of
bounds and crash.
Denial of service by various memory leaks
CVE ID: CAN-2004-0222
Various memory leaks in packet processing can be triggered
by a remote attacker until all available memory is exhausted,
resulting in eventual termination of the daemon.
6. Contact Information
Rapid7 Security Advisories
Email: advisory@rapid7.com
Web: http://www.rapid7.com/
Phone: +1 (617) 603-0700
7. Disclaimer and Copyright
Rapid7, LLC is not responsible for the misuse of the information
provided in our security advisories. These advisories are a service
to the professional security community. There are NO WARRANTIES
with regard to this information. Any application or distribution of
this information constitutes acceptance AS IS, at the user's own
risk. This information is subject to change without notice.
This advisory Copyright (C) 2004 Rapid7, LLC. Permission is
hereby granted to redistribute this advisory, providing that no
changes are made and that the copyright notices and disclaimers
remain intact.
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漏洞信息

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漏洞描述

OpenBSD contains a flaw that may allow a remote denial of service. The issue is triggered when an attacker sends a specially crafted isakmp packet, and will result in loss of availability for the service.

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时间线

公开日期:
2004-03-23

发现日期:
2004-03-23

利用日期:Unknow

解决日期:Unknow

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解决方案

Currently, there are no known workarounds or upgrades to correct this issue. However, OpenBSD has released a patch to address this vulnerability.

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受影响的程序版本

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漏洞讨论

A remote denial of service vulnerability exists in OpenBSD's isakmpd daemon. This issue is due to a failure of the process to handle malformed ISAKMP packets.

This issue could be leveraged to cause the affected isakmpd daemon to enter an infinite loop, effectively denying service to legitimate users.

This issue was previously reported in OpenBSD isakmpd Multiple Unspecified Remote Denial Of Service Vulnerabilities (BID 9907). That BID will be retired.

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漏洞利用

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: vuldb@securityfocus.com &lt;mailto:vuldb@securityfocus.com&gt;.